' The method of calculation is fufficiently obvious without fpecihcatian.To tbit qmfiion am(lru8ums lt;were likewife ret civ id from the Rev. Mr Law/bn* end Mr S. Ogle 4 and algebraical folutions from Mefs. Barker, Borrow, Fowler*Gawith, and Reynolds*in*. Quest. (13) anfwered by Mr Reuben Burrow, Teacher of the Matbedut^ticks at Portimoutb.If c ss a* 14.1 K9 tcc.m ssthe lemitranfverfe diameter of O